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Steel and Composite Structures
  Volume 32, Number 4, August25 2019 , pages 443-454
DOI: https://doi.org/10.12989/scs.2019.32.4.443
 


Theoretical and experimental study on shear strength of precast steel reinforced concrete beam
Yong Yang, Yicong Xue and Yunlong Yu

 
Abstract
    With the aim to put forward the analytical model for calculating the shear capacity of precast steel reinforced concrete (PSRC) beams, a static test on two full-scale PSRC specimens was conducted under four-point loading, and the failure modes and strain developments of the specimens were critically investigated. Based on the test results, a modified truss-arch model was proposed to analyze the shear mechanisms of PSRC and cast-in-place SRC beams. In the proposed model, the overall shear capacity of PSRC and cast-in-place SRC beams can be obtained by combining the shear capacity of encased steel shape with web concrete determined by modified Nakamura and Narita model and the shear capacity of reinforced concrete part determined by compatible truss-arch model which can consider both the contributions of concrete and stirrups to shear capacity in the truss action as well as the contribution of arch action through compatibility of deformation. Finally, the proposed model is compared with other models from JGJ 138 and AISC 360 using the available SRC beam test data consisting of 75 shear-critical PSRC and SRC beams. The results indicate that the proposed model can improve the accuracy of shear capacity predictions for shear-critical PSRC and cast-in-place SRC beams, and relatively conservative results can be obtained by the models from JGJ 138 and AISC 360.
 
Key Words
    steel reinforced concrete beams; precast concrete; shear capacity; modified truss-arch model; experimental study
 
Address
(1) Yong Yang, Yicong Xue, Yunlong Yu:
School of Civil Engineering, Xi'an University of Architecture and Technology, Shaanxi, China;
(2) Yicong Xue:
School of Natural and Built Environment, Queen's University Belfast, Northern Ireland, UK;
(3) Yunlong Yu:
Key Lab of Structure and Earthquake Resistance, Shaanxi, China.
 

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